A posthumous republication of Kaplan's (b. 1918) text on the philosophy of social science, first published in 1964 by Chandler Publishing, San Francisco. He emphasizes what unites the behavioral sciences rather than their differences, and skirts the bitter methodological disputes by insisting on the importance of those qualities intrinsic to the overall aspirations of the social sciences. Annotation c. by Book News, Inc., Portland, Or.